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SQL-EXISTS Operator 

Pooja Goel  |   Nov 9, 2019  |  Views: 20

Description:

This Operator is used to check presence of data in Subquery . 


If there are any records in Subquery , 


This operator will return “TRUE” otherwise  It will return FALSE. 


It can be used with SELECT, DELETE,INSERT,UPDATE Statement.


Syntax :

SELECT COLUMN_NAME FROM TABLE_NAME WHERE EXISTS
(SELECT COLUMN_NAME FROM TABLE_NAME)


Example : There are created “Employee” and "Department" tables in a database


 

The following query will return DepartmentName  of “Employee”  for DepartmentId which exists in “Employee” Table.


SELECT NAME AS 'DEPARTMENT NAME' FROM
DEPARTMENT D
WHERE EXISTS (SELECT NAME FROM EMPLOYEE E WHERE E.DEPARTMENTID=D.ID )
 

Output:




Comments:
Content Contributor
Pooja Goel

Pooja Goel

Sr. Software developer at Damco Solutions Pvt. Ltd.  |   Noida, Uttar Pradesh, India

I am a sr. software developer working on technologies like SQL, SSIS, SSRS, DB2,Tableau, ASP.NET having 7 years of experience.


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